We travel SD quite a bit and really like Rafter J Bar in Hill City. Close to Custer State Park, Rushmore, Wind Cave, bike/walk trail, etc. but not crazy crowded or full of mini golf and bumper boats (not our cup of tea). Elkhorn Ridge in Spearfish, SD (drive Spearfish Canyon and visit Deadwood) is another favorite. We rely on rvparkreviews.com as we have found the reviews to be accurate. CO-we have stayed at KOA in Estes Park (an old KOA so pretty tight sites) and have also avoided the crowds and saved a bit by staying in Loveland and driving into Rocky Mtn. park to visit.

Cheyenne Mtn. State Park in Colorado Springs is a wonderful place to camp. Full hookups and magnificent views. State park which requires a daily permit, but still cheaper than most private campgrounds. Might need an advance reservation as very popular with locals.

Tennessee look at Roan Mountain State Park or Fall Creek Falls, two of our favorite state parks, both have full hookups and Roan now has wifi, not sure about Fall Creek Falls. You can make reservations on their website site. Tennessee has some really great state parks and recently renovated well equiped campgrounds.

Check out Lake Michigan Campground of Manistee National Forest......No electricity but 3 miles of sandy beach....southern 1.5 miles open to dogs....northern 1.5 mi people only.....no hot showers....but folks take their Dr Bronners down to the beach...lotsa hiking trails...some open to off-road bikes....paved roads open to bikes...little traffic.

There is another thread going around regarding whether or not to reserve campgrounds in advance. With some obvious exceptions e.g. National Park campgrounds, many, many campers just go with the flow and call while they are on the road. We just finished a 12,000 mile trip around the entire western US last fall and never had a single reservation more than one day in advance. In fact, most of them were acquired the same day. When we saw something we liked we stopped a day or two; when we saw that we were getting tired, we just got out the Good Sam catalog and my DW started calling while I drove!

Like Michellewood, I am new to RVing. But Michelle, Northern New England (ME, NH & VT) Have a lot of hidden gems. Now that I have graduated to RVs (40 years tenting), I am ready to see this great Country we live in. (2 trips planned - Minn & NC). Can't wait!